Jack, here's a link to the company where I get the c-f sheets from...
They come pre finished with a clear resin coat, the peel & stick 3M backing is an additional $4.00 per.
Click on "rigid carbon fiber panels" on the home page, & you'll find quite a selection of colors, sizes, thicknesses, etc.
Not cheap, but good quality stuff...
http://compositeenvisions.com/